Other measures announced were a systematic monitoring of premium phone services and the publication of clear rules on competitions.

But the first measure to be introduced was the review of current and forthcoming shows.

Sir Graham warned the broadcasters this was not to be taken lightly.

Chairman Sir Alistair Graham said: "If we have any evidence that a possible criminal offence has occurred, we have very close links with the City of London police force and I can assure you we would refer any such evidence for them to investigate."

Icstis also has the power to impose heavy fines for wrongdoing.

The regulator is already investigating six other shows: Channel 4's Richard and Judy, the BBC's Saturday Kitchen and ITV programmes, Ant and Dec's Saturday Night Takeaway, The X Factor, Soapstar Superstar and I'm A Celebrity... Get Me Out Of Here!